NATE Air Conditioning and Heat Pumps Practice Exam

A resistance reading of 0 Ω across a coil indicates that the coil is shorted. This means that there is a direct path for electrical current to flow with no resistance, which typically signifies an internal failure between the windings of the coil. In a properly functioning coil, you would expect to see a certain level of resistance that indicates the winding is intact. When the reading is zero, it suggests that the coil is no longer operational due to excessive current flow, leading to potential damage and short-circuiting within the coil's structure. Understanding this concept is crucial for diagnosing coil issues in air conditioning and heat pump systems.